Features: brand new and high quality Made of hard alloy, super durable. Easy to Install and remove: they could be disassembled from the tires after winter. The screw in tire studs can increase the friction between the tire surface and the ground, so as to improve the stability of the vehicle in the process of running, very suitable for driving or riding on snowy days, and the small size is also applicable for snow boots, allowing you to go climbing, hiking, camping without sliding and falling easily. You will receive 100 pieces of carbide screw tire studs , enough to satisfy your demands for daily use and replacement, you can store them for a long term use or share them with your families and friends. It can be installed on the sole to prevent slipping when walking on ice. Specifications: Material:Alloy Size:Approx.9x4mm/0.35x0.16in,12x4mm/0.47x0.16in Type:A,B,C(Installation Tool) Net Weight:22-65g Package Includes: 100x Anti-Slip Screws or 1x Installation Tool note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.